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Vgl. Lorenzen, P.: Math. Z.54, 1 (1951).
Lorenzen, P.: Math. Z.53, 162 (1950).
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Lorenzen, P. Über endliche Mengen.. Math. Ann. 123, 331–338 (1951). https://doi.org/10.1007/BF02054956
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DOI: https://doi.org/10.1007/BF02054956